Oberkante Unterlippe
When something is just about to break, like a man with a broken leg trying to run a marathon.
His budget was at Oberkante Unterlippe, one more expense and it was gone.
The cake was at Oberkante Unterlippe, one more layer and it was a disaster.
Her tolerance was at Oberkante Unterlippe, one more swear word and she was screaming.